Elevator safety device.



PATENTED JUNE 7, 1904. F. KOGAB. ELEVATOR SAFETY DEVICE.

APPLICATION FILED MAR. 2. 1904.

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UNTTED STATES Patented June 7, 1904.

PATENT @TTIQE.

FRANK KOCAB, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOROF ONE- HALF TO G. W. STEIGLEDER, OF ALLEGHENY, PENNSYLVANIA.

ELEVATOR SAFETY DEVICE.

SPECIFICATION forming part of Letters Patent No. 762,240, dated June '7, 1904.

Application filed March 2, 1904. Serial No. 196,168.

Toal'l whom. it may concern.-

'the event of the breaking of the cable or the breaking of any of the apparatus. by which the cable is sustained and moved.

My invention consists in the novel construction, combination, and arrangement of parts hereinafter described and claimed.

In the accompanying drawings, illustrating my improvement, Figure 1 is a view in front elevation of an elevator-car and part of the side beams or guides between which the elevator-car runs. Fig. 2 is a side view of the same, the side beams or guides being broken away. Fig. 3 is an end elevation of a portion of the upper part of the frame of the elevatorcar. Fig. 4 is a side elevation of the parts shown in Fig. 3, these figures being on an enlarged scale. Fig. 5 is a vertical transverse sectional view of the elevator-car. Fig. 6 is a plan view of the same. Figs. 7 and 8 are enlarged views of parts of the safety device. Fig. 9 is an end view showing the grippingjaws in engagement with the side beams or guides of the elevator.

The elevator-car is of the usual or of any desired construction and is composed of the top 1, the sides 2, and the bottom 3. The car is arranged to slide between the side beams or guides 4 4, these parts being of the usual form in crosssectionthat is, substantially T-shaped in cross-section, as shown in Fig 6.

On each side of the top of the elevator-car is mounted an open frame 5, which frames are connected by cross-bars 6 6. Two shafts 7 7 are journaled in the side frames 5 5, and the shafts project beyond the frames alongside of the beams or guides 4, and on each end (N0 model.)

' of each shaft is arranged acam 8, these cams being preferably formed with small teeth on their inner edges, so that when the cams are brought into engagement with the sides of the guide-bars 4 they will strongly bite the same. Within the side frames 5 the shafts 7 carry ratchet-wheels 9 9, which have their teeth inclined in opposite directions, the teeth being engaged by the downwardly-bent ends 10 10 of a spring 11, that is fastened to the frame 5. The shafts 7 7 carry at their center rocking arms 12 12, that are pivotally attached to curved links 13 13, which are in turn pivotally attached to a coupling 14, to which the cable or rope of the-elevator is secured in any suitable manner. The coupling is composed of horizontal arms and an upwardly-extending rod to which the cable is attached. The upwardly extending rod of the coupling passes through an arched plate 15, that is attached to the frames 5 5, and in the normal position of parts that is, when the car is suspended on the cablethe horizontal arms of the coupling 14 bear on the lower side of the arched plate 15, the several parts being shown in the relative positions which they occupy when the car is suspended on the cable in Fig. 5 of the drawings. The coupling 14 has a downwardly-extending leg 16, which projects between the cross-bars 6 6 of the frame 5 and serves to guide the coupling and to maintain it in the vertical position. Spiral springs 17 17 surround each of the shafts 7 7 between the ratchet-wheels 9 and rocking arms 12, one end of each spring being attached to the adjacent ratchet-wheel and the other end being attached to the adjacent rocking arm 12.

While I have shown and described the cams 8 as being provided with teeth, such teethare not necessary in all cases, as the shape of'the cams is such that they bind tightly against the sides of the guides 4 whether or not they are provided with teeth.

The operation of my invention is as follows: The springs 17 ,it is to be understood,are wound tightly upon the shafts, such winding being effected by means of a spanner applied to the ratchet-wheels 9, the ends 10 of-the springs 11 acting as dogs to hold the ratchet-wheels i and with the coupling 14 against the arched plate 15 and the cams 8 8 thrown out so as to be disengaged from the side guides 4 4. When the parts are in this position, the car will travel up and down in the usual manner, being guided at its lower edge by the usual guide-plates and at its upper edge between the bases of the cams 8 8. If now the cable or rope should break or an accident occur to any part of the rope-supporting devices or the machinery by which the elevator is moved and the rope should suddenly relax, the springs 16 16, which have been held under tension by the horizontal position of the rocking arms 12 12, will instantly turn the shafts 7 7 and draw the cams 8 8 into engagement with both sides of both guide-bars, and the cams will grip the guide-bars so firmly that the car will be prevented from falling. This action will take place so rapidly that the movement of the car will be arrested the instant the tension of the cable or rope is relaxed and the car will remain suspended on the guides 4. The position of the cams when gripping the guide-bar is shown in Figs. 2 and 3, and from the position of parts it will be observed that the greater the weight upon the car the more firmly the cams 8 8 will grip the guides 9 9.

The tension of the springs 16 16 need not be very great, as their function is mainly to bring the cams into engagement with the guides 4 L, the weight of the car then tending to cause the cams to grip the guide-bars. If necessary, the tension of the springs can be regulated by winding them up by means of a spanner applied to the ratchet-wheels 9 9, as before described.

Having described my invention, I claim- 1. The combination with the vertical sliderails, and the car mounted to slide on said rails, of an open frame on top of said car, shafts journaled in said frame and extending beyond the same, cams carried on the projecting ends of said shafts to engage the slide-rails, ratchetwheels mount-ed on the shafts, a spring havingits ends engaging the ratchet-wheels, rocking arms mounted on the shafts, links pivotally attached to said arms, a coupling pivotally attached to said links and to which coupling a car-supporting cable is adapted to be attached, and springs on the shafts and attached to the ratchet-wheels and rocking arms, substantially as described.

2. The combination with the vertical sliderails, and the car mounted to slide on said rails,

of an open frame mounted on top of the car,

shafts journaled in said frame with their ends extending beyond the frame, toothed cams mounted on said extending ends, and lying at opposite sides of the slide-rails, rocking arms carried by said shafts, links pivotally attached at their one end to said rocking arms, a cablecoupling to which the other ends ofsaid links are pivotally attached,ratchet-wheels mounted on said shafts adjacent their ends, spiral springs arranged on the shafts with their ends attached to the ratchet-w heels and rocking arms respectively, and springs carried by the frame and provided with downwardly-turned ends to engage the ratchet-wheels and hold the spiral springs on the shafts normally under tension, substantially as described.

In testimony whereofl affix my signature in the presence of two witnesses.

FRANK KOOAB.

Witnesses:

H. (J. EVERT, JOHN GRon'rzrNeER. 

